Solid polymer electrolyte based on PEO/PVDF/Mg(ClO4)2-[EMIM][ESO4] system for rechargeable magnesium ion batteries

Solid polymer electrolyte (SPE) membranes were prepared using the solution-cast technique by mixing polyethylene oxide/polyvinylidene fluoride/magnesium perchlorate (PEO/PVDF/Mg(ClO4)(2)) ternary system with concentrations of 10, 20, 30, and 40 wt. % of the ionic liquid (IL) 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][ESO4]. The SPE membrane of SPE:IL (60:40 wt. %) demonstrated several electrochemical properties that satisfy a potential application in rechargeable magnesium ion batteries (MIBs) such as good conductivity at room temperature (similar to 5.4 x 10(-5) S cm(-1)) and high Mg2+ ion transport number (t(Mg2+) similar to 0.34 ). The results by X-ray diffraction (XRD) revealed an amorphous structure, which favored the diffusion of Mg2+ ions within the SPE structure. In addition, differential thermal analysis (DTA) showed the melting point at similar to 329 K. Fourier transform infrared spectroscopy (FTIR) confirmed the presence of characteristic functional groups in SPE membrane, identified by the appearance of the absorption bands C-O-C, CH2, C-O, ClO4-, and C-O-S-O. The electrochemical stability window of similar to 4.2 V was determined using linear sweep voltammetry (LSV).

Automated summary

Solid polymer electrolyte (SPE) membranes were prepared using the solution-cast technique, and the electrochemical properties of SPE:IL (60:40 wt. %) with ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][ESO4] were studied. The SPE membrane demonstrated good conductivity at room temperature and high Mg2+ ion transport number, indicating its potential application in rechargeable magnesium ion batteries. The amorphous structure of the SPE membrane favored the diffusion of Mg2+ ions, and FTIR confirmed the presence of characteristic functional groups.